New Hampshire Code of Administrative Rules
Env - Department of Environmental Services
Subtitle Env-Wt - Wetlands Programs
Chapter Env-Wt 900 - STREAM CROSSINGS; CERTIFIED CULVERT MAINTAINER PROGRAM
Part Env-Wt 904 - DESIGN AND CONSTRUCTION OF STREAM CROSSINGS
Section Env-Wt 904.09 - Repair, Rehabilitation, or Replacement of Tier 3 and Tier 4 Existing Legal Crossings
Current through Register No. 13, March 27, 2025
(a) The repair, rehabilitation, or replacement of tier 3 stream crossings shall be limited to existing legal crossings where the tier classification is based only on the size of the contributing watershed.
(b) Rehabilitation of a culvert or other closed-bottom stream crossing structure pursuant to this section may be accomplished by concrete repair, slip lining, cured-in place lining, or concrete invert lining, or any combination thereof, except that slip lining shall not occur more than once.
(c) A project shall qualify under this section only if a professional engineer certifies, and provides supporting analyses to show, that:
(d) Repair, rehabilitation, or replacement of a tier 4 stream crossing shall comply with Env-Wt 904.07(d).
#9714, eff 5-12-10